I answered this question as best as I understood it in my original post.
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Import your mesh.
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Go to the Texture menu of the Tool section. Hit “Colorize”.
(Do not press Tex>Col, unless you specifically need this functionality. This button is for use when you already have an existing texture, and would like to convert that existing texture into Colors directly on the polygons, via polypaint. If you do need to use this, make sure to reselect the 2048 texture in the texture menu before you want to transfer further detail to it)
- Paint as desired.
4)When you want to create a texture from the polypaint, create a new texture in the texture menu at 2048 x2048, or whatever the desired size is. If no other texture is created /selected when you press Col>Txr, it will create one at a default size of 1024 x 1024.
This will temporarily overwrite your polypaint in the window with the blank texture, but the polypaint detail has not gone anywhere.
5)Make sure UVs are enabled. Press Col>Txr in the Texture section of the Tool menu. This will transfer that polypaint detail to that selected 2048x2048 texture image.